this phenomenon is not nearly so mind blowing as this guy is making it out to be

there are much fewer yield signs out there because they have been replacing them with 2-way stop signs for safety reasons

so most of the yeild signs that you saw when you were driving probably were yellow, and that's the first thing that comes to mind

let me guess- he was selling audio tapes on how to change your perception of life blah blah blah and he was trying to make himself look like some kind of genius